十进制图书分类法由两位比利时书目专家（Paul Otlet、Henri la Fontaine）19世纪末在杜威十进制图书分类法的基础上继续研发的分类方法。此种分类方法由数字和特殊符号组成，把涉及各种知识体系及学科的书籍予以分类。介于数字和符号无语言障碍的特性，该分类法在世界各地的图书馆中被广泛应用。
英语百科
Universal Decimal Classification 通用十进制图书分类法
The Universal Decimal Classification (UDC) is a bibliographic and library classification developed by the Belgian bibliographers Paul Otlet and Henri La Fontaine at the end of the 19th century. UDC provides a systematic arrangement of all branches of human knowledge organized as a coherent system in which knowledge fields are related and inter-linked.